# Codex Pass 03 — Dataset Manager

Task:
Implement dataset upload, metadata extraction dispatcher, dataset list/detail endpoints and frontend dataset table shell.

Read:
- docs/MODULE_BUILD_CONTRACTS.md
- docs/ACCEPTANCE_TEST_CATALOG.md
- docs/DEMO_FIXTURE_MANIFEST.md

Required:
- Upload endpoint.
- Dataset status transitions.
- GeoJSON metadata extraction.
- Unsupported extension error.
- Frontend route with empty/loading/error/success states.

Acceptance:
- GeoJSON fixture upload works.
- Dataset metadata appears in UI or API response.